Bug #9022: all? method in empty array should return false

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin12.3.0]
• Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

[lucascaton (Lucas Caton)]

This is expected:

[].any?(&:whatever?)

=> false

But this is not the behavior which I expect:

[].all?(&:whatever?)

=> true

Do you agree with me?

[phluid61 (Matthew Kerwin)]

This is a duplicate of #8723

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Rejected

[alexeymuranov (Alexey Muranov)]

Since commenting on the other thread, i have leant that the proposed interpretation of the "for all" quantifier is apparently called "existential import" and apparently was a matter of debate in the 19th century (http://en.wikipedia.org/wiki/Syllogism#Existential_import for example).